Oscillators – Solid state active element oscillator – Transistors
Patent
1998-05-29
2000-07-25
Kinkead, Arnold
Oscillators
Solid state active element oscillator
Transistors
331 74, 331183, 331158, 331 36C, 331177R, 331 17, 331179, H03B 500
Patent
active
060941057
ABSTRACT:
An oscillator having an adjustable output frequency comprises a resonator, an inverting amplifier coupled to the resonator, a variable capacitance coupled to the resonator and to the amplifier, and a shift register coupled to the variable capacitance. The variable capacitance comprises a first bank of switchable capacitors coupled to an input of the oscillator and a second bank of switchable capacitors coupled to an output of the oscillator. The shift register includes a plurality of bits and is configured such that the logic state of each bit determines the switching state of a corresponding capacitor from each bank of switchable capacitors. By shifting the bits in the shift register, the variable capacitance is varied, causing an adjustment in the output frequency of the oscillator.
REFERENCES:
patent: 4479259 (1984-10-01), Fenk
patent: 5036294 (1991-07-01), McCaslin
patent: 5084685 (1992-01-01), Moeller et al.
patent: 5446420 (1995-08-01), Westwick
patent: 5543761 (1996-08-01), Klughart
patent: 5834983 (1998-11-01), Higgins, Jr.
Vittoz, Eric A., et al., "High-Performance Crystal Oscillator Circuits: Theory and Application," IEEE Journal of Solid-State Circuits, vol. 23, No. 3, Jun. 1988, pp. 774-783.
Huang, Qiuting et al., "A 200.mu.A, 78MHz CMOS Crystal-Oscillator Digitally Trimmable to 0.3 PPM," Swiss Federal Institute of Technology, Integrated Systems Laboratory, 1996, pp. 305-308.
Qiuting, Huang, et al., "Design and Implementation of a CMOS VCXO for FM Stereo Decoders," IEEE Journal of Solid-State Circuits, vol. 23, No. 3, Jun. 1988, pp. 784-793.
Lee, Yuji et al., "A Wide Variable Range VCXO For IC," 1996 IEEE International Frequency Control Symposium, Jun. 5-7, 1996, IEEE Catalog No. 96CH35935, pp. 722-727.
Methot, Francois (RadioSysteme, Inc.), "A Simple Clock and PSK Carrier Recovery Circuit," RF Design Awards, May 1991, pp. 58-59.
Intel Corporation
Kinkead Arnold
LandOfFree
Oscillator with digital frequency control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Oscillator with digital frequency control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oscillator with digital frequency control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1339336